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Elementary and Intermediate Algebra
Mark Dugopolski, Southeastern Louisiana University
Quadratic Equations, Functions, and Inequalities
Quadratic Functions and Their Graphs

Warm-Ups



1

The ordered pair (-2, -1) satisfies y = x2 - 5.
A)TRUE
B)FALSE
2

The y-intercept for y = x2 - 3x + 9 is (9, 0).
A)TRUE
B)FALSE
3

The x-intercepts for y = x2 - 5 are (51/2, 0) and (-51/2, 0).
A)TRUE
B)FALSE
4

The graph of y = x2 - 12 opens upward.
A)TRUE
B)FALSE
5

The graph of y = 4 + x2 opens downward.
A)TRUE
B)FALSE
6

The vertex of y = x2 + 2x is (-1, -1).
A)TRUE
B)FALSE
7

The parabola y = x2 + 1 has no x-intercepts.
A)TRUE
B)FALSE
8

The y-intercept for y = ax2 + bx + c is (0, c).
A)TRUE
B)FALSE
9

If w = -2v2 + 9, then the maximum value of w is 9.
A)TRUE
B)FALSE
10

If y = 3x2 - 7x + 9, then the maximum value of y occurs when x = 7/6.
A)TRUE
B)FALSE








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